package com.cn.jm.util;
import java.awt.*;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.OutputStream;
import java.util.Hashtable;
import java.util.Random;
import javax.imageio.ImageIO;

import com.cn.jm.core.tool.JMToolString;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.BinaryBitmap;
import com.google.zxing.DecodeHintType;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.Result;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
public class QRCodeUtil {
    private static final String CHARSET = "utf-8";
    private static final String FORMAT_NAME = "JPG";
    // 二维码尺寸
    private static final int QRCODE_SIZE = 300;
    // LOGO宽度
    private static final int WIDTH = 80;
    // LOGO高度
    private static final int HEIGHT = 80;


    /**
     * 功能描述: 生成二维码
     * @author
     * @date 2020/4/30
     * @param content
     * @param imgPath
     * @param remark
     * @param destPath
     * @param needCompress 是否压缩
     * @return void
     */
    public static void encode(String content, String imgPath, String remark, String destPath, boolean needCompress) throws Exception {
        BufferedImage image = QRCodeUtil.createImage(content, imgPath, remark, needCompress);
        mkdirs(destPath);
        ImageIO.write(image, FORMAT_NAME, new File(destPath));
    }

    /**
     * 功能描述: 解析二维码
     * @author
     * @date 2020/4/30
     * @param file
     * @return String
     */
    public static String decode(File file) throws Exception {
        BufferedImage image;
        image = ImageIO.read(file);
        if (image == null) {
            return null;
        }
        BufferedImageLuminanceSource source = new BufferedImageLuminanceSource(image);
        BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
        Result result;
        Hashtable hints = new Hashtable();
        hints.put(DecodeHintType.CHARACTER_SET, CHARSET);
        result = new MultiFormatReader().decode(bitmap, hints);
        String resultStr = result.getText();
        return resultStr;
    }

    /**
     * 功能描述: 创建二维码图片
     * @author
     * @date 2020/4/30
     * @param content
     * @param imgPath
     * @param remark
     * @param needCompress
     * @return java.awt.image.BufferedImage
     */
    private static BufferedImage createImage(String content, String imgPath, String remark, boolean needCompress) throws Exception {
        Hashtable hints = new Hashtable();
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        hints.put(EncodeHintType.CHARACTER_SET, CHARSET);
        hints.put(EncodeHintType.MARGIN, 1);
        BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, QRCODE_SIZE, QRCODE_SIZE,
                hints);
        int width = bitMatrix.getWidth();
        int height = bitMatrix.getHeight();
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        for (int x = 0; x < width; x++) {
            for (int y = 0; y < height; y++) {
                image.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);
            }
        }
        if (JMToolString.isNotEmpty(imgPath)) {
            // 插入图片
            QRCodeUtil.insertImage(image, imgPath, needCompress);
        }
        // 插入备注
        if (JMToolString.isNotEmpty(remark)) {
            image = insertRemark(image, remark);
        }
        return image;
    }

    /**
     * 功能描述: 插入备注到二维码
     * @author
     * @date 2020/4/30
     * @param source
     * @param remark
     * @return BufferedImage
     */
    private static BufferedImage insertRemark(BufferedImage source, String remark) {
        // 建立画布并设置背景色，一般设置为白色
        // 将二维码信息和备注信息均渲染在该画布上，作为最终的输出
        BufferedImage logoReamarkImage = new BufferedImage(300, 325, BufferedImage.TYPE_INT_RGB);
        Graphics graphics = logoReamarkImage.getGraphics();
        graphics.setColor(Color.WHITE);
        graphics.fillRect(0, 0, 300, 325);
        graphics.dispose();

        // 将生成的二维码转化为像素数组，并将数组写到画布logoReamarkImage上
        int[] imageNewArray = new int[300 * 300];
        imageNewArray = source.getRGB(0, 0, 300, 300, imageNewArray, 0, 300);
        logoReamarkImage.setRGB(0, 0, 300, 300, imageNewArray, 0, 300);

        // 写备注信息
        Graphics gText = logoReamarkImage.createGraphics();
        gText.setColor(Color.black);
        gText.setFont(new Font(null, Font.PLAIN, 18));
        gText.drawString(remark, 80, 320);
        gText.dispose();

        return logoReamarkImage;
    }

    /**
     * 功能描述: 插入logo到二维码
     * @author
     * @date 2020/4/30
     * @param source
     * @param imgPath
     * @param needCompress
     * @return void
     */
    private static void insertImage(BufferedImage source, String imgPath, boolean needCompress) throws Exception {
        File file = new File(imgPath);
        if (!file.exists()) {
            System.err.println("" + imgPath + "   该文件不存在！");
            return;
        }
        Image src = ImageIO.read(new File(imgPath));
        int width = src.getWidth(null);
        int height = src.getHeight(null);
        if (needCompress) { // 压缩LOGO
            if (width > WIDTH) {
                width = WIDTH;
            }
            if (height > HEIGHT) {
                height = HEIGHT;
            }
            Image image = src.getScaledInstance(width, height, Image.SCALE_SMOOTH);
            BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
            Graphics g = tag.getGraphics();
            g.drawImage(image, 0, 0, null); // 绘制缩小后的图
            g.dispose();
            src = image;
        }
        // 插入LOGO
        Graphics2D graph = source.createGraphics();
        int x = (QRCODE_SIZE - width) / 2;
        int y = (QRCODE_SIZE - height) / 2;
        graph.drawImage(src, x, y, width, height, null);
        Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);
        graph.setStroke(new BasicStroke(3f));
        graph.draw(shape);
        graph.dispose();
    }

    /**
     * 功能描述: 创建文件夹
     * @author
     * @date 2020/4/30
     * @param destPath
     * @return void
     */
    private static void mkdirs(String destPath) {
        File file = new File(destPath);
        // 当文件夹不存在时，mkdirs会自动创建多层目录，区别于mkdir．(mkdir如果父目录不存在则会抛出异常)
        if (!file.exists() && !file.isDirectory()) {
            file.mkdirs();
        }
    }

}
